Improvement in smithsj vises



PATENT OEEIc S. S. HEPWORTH, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN SMITHS VISES.

Specification forming` part of LettersPatent No. 53,2l, dated April l0,1866.

To all lwhom it may concern.'

Be it known that I, S. S. HEPWORTH, of Boston, in the county of Suffolkand State of Massachusetts, have invented a new and Improved Vise 5 andI do hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,and to the letters ot' reference marked thereon.

Figure l is a perspective view of the improved vise. Fi g.2 is avertical sectionthrou gh the screw F, showing the improvement. Fig. 3 isa perspective view of the bushing O, in which the screw revolves and bywhich it is secured to either movable or lixed part of the vise. Thisbushing may be made in one or more pieces. It it is made in one piece,the collar or projection m must be made separate from the screw, andat'ter the bushing is slipped on the collar may be secured either byshrinking or by pinning it to the screw.

The nature of' my invention consists in providing the screw F with acovering` or casing of pipe, B, attached to either movable or ixed partof the vise, and in the manner of attaching the nut A to either fixed ormovable part ot' the vise by means of the collar H, so that the pipe Bcan pass over it when the vise is shut; also, in the peculiar manner ofattaching the screw F to either movable or lixed part of the vise bymeans of a bushing, O, made in one or more parts and tting into thegroove G in the shank of the screw F. This bushing is lirmly held in itsplace by means of the setscrew S or some similar device.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

The jaws of the vise and the slide I may be of ordinary construction.The screw F differs from the usual form in being provided with thegroove G for the reception of the bushing` O, which may be turned intothe shank or formed by projections, substantially as shown in thedrawings. This screw is inserted into its place with the bushing O ttedand placed upon it. The bushing is then secured in its place by theset-screw S, which retains the screw in its position, but allows it torevolve freely.

The tube B is inserted into either the movable or fixed part of the visea sufficientdistance to hold it firmly, and is retained in its place bya pin or some other common device.

The nut A is of an elongated form, as shown in the drawings, and isprovided with the collar H, which is firmly litted into a recess at theback end of the vise. This collar is ot' larger diameter than the restof nut, so that the tube B can slide on the nut as far back as thecollar. The nut and collar may be made in one or more pieces, as is mostconvenient.

When the vise is in use the tube B slides in and out on the nut A andshields the screw from iilings or anything that might interfere with itsproper action.

I claim- The sleeve B, in combination with the nut A, connected to themovable jaw E, operating as and for the purpose described.

S. S. HEPWORTH.

Witnesses:

D. E. SoMEs, WM. HENRY PRINCE.

